Burglar-alarm



No. 610,826. Patented Sept. l3, I898.

- J. w PARRISH.

BURGLAR ALARM.

(Application filed May 14 1898 (N0 Model.)

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B U RG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 610,826, datedSeptember 13, 1898. Application filed May 14, 1898. Serial No. 680,714.(No model.)

To (tZZ whom it may concern:

Be itknown that I, JOHN W. PARRISH, a citizen of the United States, anda resident of Milton, in the county of Oabell and State of WestVirginia, have invented certain new and useful Improvements inAlarm-Bells; and I do hereby declare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to alarm-bells used in connection with door locksand knobs in such manner that when the knob is turned in eitherdirection to withdraw the latch an alarm will be sounded.

The invention is especially applicable to the doors of shops and retailstores, although it can be employed on the doors of buildings and roomsgenerally where it is desirable that the entrance of a person should beindicated by sounding an alarm.

The invention consists in the novel construction and combination ofparts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is an elevation showing a portionof a door and a lock with the near knob removed provided with myimprovements. Fig. 2 is an elevation of the striking mechanism, the bellor gong being removed. Fig. 3 is a similar view showing the parts in adifferent position.

In the said drawings the reference-numeral 1 designates a door, and 2the lock thereof,

which may be of any ordinary or suitable construction.

The numeral 3 designates the knob-spindle, by which the latch iswithdrawn from the keeper, as usual.

The numeral 4 designates a metal plate having a square aperture throughwhich the spindle 3 passes. This plate can be easily removed from andattached to the spindle by removing the knob and pushing on or pullingoff the plate. At one side said plate is provided with apertured lugso,with which are loosely connected bent rods 6, provided at the upper endswith heads 7. These rods pass loosely through apertures in a block 8,adjustably secured to a rod 9 bya sctscrew 11.

At one end this rod 9 is pivoted to one arm of an elbow-lever 10,pivoted to a circular plate 12, secured to the door. The other arm ofthis lever is provided with a pivoted dog 13, the free end of whichengages with a notch 14 and a lug 14 of a pivoted arm 15, carrying atthe otherend a rod 16, provided with a hammer or striker 17, adapted tostrike a gong 18, secured to the plate 12. Springs 19 and 20, connectedwith the elbow-lever 10 and arm 15, serve to return the same to normalposition after having been operated. The opposite ends of these springsare connected with studs 21 and 23, secured to the plate 12. Thenumeral24 designates a spring bearing against the dog 13 for forcing its freeend into engagement with the notch 14 in the arm 15.

The numeral 25 designates a lever pivoted to plate 12, the outer end ofwhich projects beyond the edge of the plate and serves as a finger-hold.The inner end of this arm is bev eled at 26, so that when in normalposition the dog 13 will rest and slide thereon when pushed forward toengage with said notch. By turning said lever, as seen in Fig. 3, theinner end thereof will actuate the dog, so that it will clear the notch14 when moved forward and no alarm will be sounded. It will thus be seenthat this lever serves the double purpose of supporting the dog and alsofor operating the same when desired, so that the door-knob may be turnedwithout sounding an alarm.

The operation will be readily understood. The striking movement issecured to the inside of the door by screwing the plate 12 thereto, andthe plate 4 is slipped on the knob-spindle and the knob placed on thelat ter. By now turning the knob in either di rection the plate 4 willbe operated, causing the rods 6 to be moved in opposite directions, andthe head of one rod, coming in contact with the block 8, will actuatethe same, which will turn the elbow-lever 10, causing the pivoteddog 13to engage with the notch in arm 15. As the arm 15 is moved by the dogthe lug 14 will strike the latter, releasing the arm, so as to allow thelatterto quickly return and the hammer and striker to sound an alarm. Itwill thus be seen that an alarm is sounded no matter in which directionthe door-knob is turned.

Having thus described my invention, What I claim is 1. In a door-alarm,the combination with a door-knob and spindle, of the removable plate onthe said spindle, the headed rods, the block through which said rodsloosely pass, the rod to which said block is adj ustably secured, theset-screw for holding said block in its adjusted position, and the belland connections, substantially as described.

2. The combination with the apertured plate adapted to be attached to adoor-knob spindle, the headed rods connected therewith, the blockthrough which said rods loosely pass and the rod to which said block isse-

